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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 12515238 B1

PDFFull Text
Date of Patent:
Jan. 06, 2026

Filed:

Oct. 17, 2024

Method for forming multilayer coating film

Applicants:

Kansai Paint Co., Ltd., Hyogo, JP;

Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;

Inventors:

Kentaro Kubo, Aichi, JP;

Masahiro Omura, Aichi, JP;

Takao Tsukimori, Aichi-ken, JP;

Assignees:

KANSAI PAINT CO., LTD., Hyogo, JP;

TOYOTA JIDOSHA KABUSHIKI KAISHA, Aichi-Ken, JP;

Attorney:

Wenderoth, Lind & Ponack, L.L.P.

Primary Examiner:

William P Fletcher, III

Int. Cl.
CPC ...
B05D 3/00 (2006.01); B05D 1/02 (2006.01); B05D 3/02 (2006.01); C09D 5/00 (2006.01); C09D 5/36 (2006.01); C09D 7/43 (2018.01); C09D 7/61 (2018.01); C09D 7/65 (2018.01); C09D 133/04 (2006.01);
U.S. Cl.
CPC ...
B05D 3/002 (2013.01); B05D 1/02 (2013.01); B05D 3/0218 (2013.01); C09D 5/002 (2013.01); C09D 5/36 (2013.01); C09D 7/43 (2018.01); C09D 7/61 (2018.01); C09D 7/65 (2018.01); C09D 133/04 (2013.01);
Abstract

An object of the present invention is to provide a method for forming a multilayer coating film, the method being capable of providing a multilayer coating film with excellent finished appearance and luster. The aqueous base paint (X) comprises: a hydroxy-containing acrylic resin particle (X1) having a core-shell structure wherein the shell has an acid value of 90 to 100 mg KOH/g; and a hydroxy-containing acrylic resin particle (X2) having a core-shell structure wherein the shell has an acid value of 110 to 120 mg KOH/g; and an associative thickener (X3), wherein the proportions of the hydroxy-containing acrylic resin particle (X1) and the hydroxy-containing acrylic resin particle (X2) contained in the aqueous base paint (X) are such that the ratio by mass of the hydroxy-containing acrylic resin particle (X1) to the hydroxy-containing acrylic resin particle (X2) (X1/X2) is in the range of 70/30 to 30/70. The effect pigment dispersion (Y) contains a flake-aluminum pigment (Y1), a cellulose-based rheology control agent (Y2), a surface-adjusting agent (Y3), and water, and has a solids content within the range of 2 to 6 mass %. The effect coating film formed using the effect pigment dispersion (Y) has a cured film thickness of 0.5 to 1.5 μm.

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